NS125R backfire/sluggish acceleration + other problems

[tshort2007]

Evening all. Got my AR back on the road (YAY!!!) And went for a rideout with ma brother tonight, but his NS125R has a few runnng issues

Accelerating is fine, upto about 6000rpm then the engine bogs, msfires, and backfires with a squeeky pop, followed by loads of 2stroke smoke. after about 7000rpm, it clears
the bike is stock, but has removed the restrctors from the reed block and the exhaust.

I would assume not enough fuel, but a backfire is usally too much fuel isnt it?

Also, the neutral light is temprmental, and gearsare sometimes difficult to obtain


Can anyone help?

Cheers all!

[Chris84]

Do you not need to fully re-jet the carb after de-restriction to stop the bike running lean? Has the Bike not long been de-restricted? Maybe thats his prob!
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All i want is an easy life!!

[Kickstart]

Hi

Is it an NS125R or an NSR125R. The first doesn't have any inlet restrictors.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[tshort2007]

not 100% sure. Its a k plate, steel frame, single square headlight model, non powervalve. the faring above the clocks states NS125R, but i belive its also called NSR125R.

[Kickstart]

Hi

That is an NS rather than an NSR, There isn't an intake restrictor which makes me wonder what has been removed.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[tshort2007]

probly nothing then. i thought they had a restrictor plate in there, but nothing was there when we looked. the exhaust we deristricted ourselves.